This document describes a language tag for use in cases where
it is desired to indicate the language used in an information
object, how to register values for use in this language tag,
and a construct for matching such language tags.

This document defines a "Content-language:" header, for use in
cases where one desires to indicate the language of something that
has RFC 822-like headers, like MIME body parts or Web documents,
and an "Accept-Language:" header for use in cases where one wishes
to indicate one's preferences with regard to language.